Gnil:

 

Like the previous model, the front mufflers can be acti- vated and deactivated via two map-con- trolled exhaust flaps for high engine performance. The front mufflers are activated and deactivated via vacuum- controlled exhaust flaps. When these flaps are closed, the exhaust gas is directed exclusively via the front muf- flers to the main silencer. When the exhaust flaps open, this provides a direct passage to the main silencer, resulting in a reduction in exhaust back- pressure and a further increase in engine power. 

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Porsche wrote the following in its full release:

As was the case with the predecessor, the new 911 GT3 also offers the driver the possibility of increasing the pull of the engine in the mid rev-range at the press of a button. When activated, the back-pressure in the sports exhaust system is further reduced, improving gas exchange and thus increasing the torque between 3,000 rpm to 4,000 rpm by up to 35 Nm.

It was stated just before the paragraph captioned “Switchable sports exhaust system with special exhaust manifolds”.

However, it does not identify where to perform “the press of a button”.  Which button?  It is the sport exhaust button (on the right of the console) or the race/PDK sport button (on the left of the console)?

Regarding the latter button (race/PDK sport) did you notice that the labeling of the button is inconsistent between the Preuninger/Evo video and the car on the stand in Geneva?  What is going on?  Is Porsche getting sloppy or does it evidence some last-minute political decisions?

In any case, the performance impact of the adjustable exhaust system seems a non-issue as this it is fitted on the car as standard equipment, so we need not worry.  Just find out where to press “the button”.

Cheers.  Smiley